If I wanted a car that I did not want to modify and leave bone stock or was wanting a comfortable daily driver I would definitely go with Mercedes. The S class is one car you don't mind getting stuck in traffic.
That being said if I wanted a raw drivers car that I could customize to my liking, it would be a toss-up between the M2 and M3 as I can get it in a manual.
But to be completely fair I would take a new Lotus Evora over either of those in a heartbeat :-P
RE: The BMW M2 | Should We Still Miss The E46 M3?!